Simon Cowell gave himself a new role on Saturday's (28.11.15).

Simon Cowell

Simon Cowell

The music mogul is the only judge without an act in the competition after his final competitor Anton Stephans was eliminated last weekend and Simon decided he would rate the acts from best to worst, calling it a "very important job".

There are just five acts left in the competition, Louisa Johnson, Lauren Murray, Ché Chesterman, 4th Impact and Reggie N Bollie, and each performed two songs each on Jukebox Week.

The first was a track chosen by the public while the second was picked by their mentors.

Reggie N Bollie were the hit of the night, with Simon praising them as genuine contenders.

They were even joined on stage by their mentor Cheryl Fernandez-Versini, who danced along to their first song, 'Watch Me (Whip/Nae Nae)'.

Cheryl's other group 4th Impact also impressed Simon with both songs, while Nick Grimshaw's one remaining act Che Chesterman, was praised for his second track 'Try A Little Tenderness', after failing to win over the judges with his first song, Adele's 'Hello'.

Despite being sick, Louisa Johnson's cover of Justin Bieber's 'Love Yourself' was well received and she closed the show with 'Jealous' while Lauren Murray's 'You Don't Own Me', was a hit after 'Firestone' got a muted reaction.

The 'X Factor' semi-final will air next Saturday (05.12.15).